A pull key tube plate combination

Abstract

The utility model provides a kind of pull key pipe plate combination piece, belong to the technical field of pull piece pipe, the pull key pipe plate combination piece is used to realize the fixed connection between pull key and pipe plate, including pipe plate body, pull key slot and locking wedge, the pipe plate body is flat plate structure, pull key slot is set on the pipe plate body, and it is penetrated, and pull key slot is penetrated along the thickness direction of pipe plate body and is rectangular notch shape, the locking wedge is arranged in pull key slot, the locking wedge has wedge-shaped slope, the wedge-shaped slope and the inner side wall surface of pull key slot form wedge tight cooperation, when pull key is inserted into pull key slot, the locking wedge moves along the depth direction of pull key slot, and the radial compression force is applied to pull key side surface by wedge-shaped slope, realize the fastening connection of pull key and pipe plate body;The utility model can guarantee connection reliability and be convenient for assembly maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of tube drawing technology, specifically, it relates to a tube sheet connecting component. Background Technology

[0002] In the field of mechanical engineering, pull keys are widely used as important transmission and positioning elements in the connection of shafts and hubs, the positioning of sliding guides, and various mechanical structures that need to transmit torque or withstand radial forces. The tube sheet, as the mounting base for the pull key, directly affects the working performance and service life of the entire transmission system due to the quality of the connection between the tube sheet and the pull key. Currently, the commonly used methods for connecting pull keys and tube sheets in industrial production mainly include welding, bolting, and interference fit. While welding can achieve a relatively strong connection, the high temperature generated during welding can create residual stress in the weld and heat-affected zone, leading to coarse grains and uneven hardness distribution. These metallurgical defects can easily cause fatigue cracks when subjected to alternating loads. The emergence and expansion of bolted connections require threaded holes or through holes in the tube sheet. The presence of these holes weakens the overall strength of the tube sheet, and bolted connections are prone to loosening under vibration conditions due to preload decay, requiring regular inspection and maintenance. Although interference fits provide a tight connection after assembly, they require extremely high machining precision and are difficult to disassemble. If the key needs to be replaced, it must be disassembled by heating or strong hammering, which can easily damage the tube sheet and key. These existing connection methods have problems with insufficient connection reliability or inconvenient maintenance when facing complex working conditions, especially when subjected to vibration and impact loads. Therefore, there is an urgent need to develop a new type of key-tube sheet joint structure that can ensure connection reliability and facilitate assembly and maintenance. Utility Model Content

[0003] In view of this, the present invention provides a keyed tube sheet assembly that can solve the technical problem of insufficient connection reliability in the existing keyed tube sheet connection structure. Traditional welding fixing methods are prone to stress concentration and material property deterioration in the heat-affected zone of welding. Bolted connection methods require threaded holes in the tube sheet, which damages the integrity of the tube sheet and is prone to loosening under vibration conditions. Simple plug-in connection methods cannot provide sufficient fastening force, causing the keyed tube sheet to loosen or even fall off under alternating loads. These problems of insufficient connection reliability seriously affect the safety and service life of the keyed tube sheet assembly in actual working conditions.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a keyed tube sheet assembly for achieving a fixed connection between the key and the tube sheet. It includes a tube sheet body, a keyed groove, and a locking wedge. The tube sheet body is a flat plate structure with a through-hole keyed groove extending along its thickness and forming a rectangular opening. The locking wedge is disposed inside the keyed groove and has a wedge-shaped inclined surface that forms a tight fit with the inner wall of the keyed groove. When the key is inserted into the keyed groove, the locking wedge moves along the depth direction of the groove, applying a radial clamping force to the side of the key through the wedge-shaped inclined surface, thus achieving a secure connection between the key and the tube sheet body.

[0006] The technical advantages of the pull-key tube sheet assembly provided by this utility model are as follows: By opening a through-hole pull-key groove on the tube sheet body and using the wedge-shaped inclined surface of the locking wedge block to form a wedge-tight fit with the inner wall of the pull-key groove, the pull-key can be radially pressed against the side of the pull-key by the movement of the locking wedge block along the depth direction after insertion. This wedge-tight fixing method can generate a continuous and stable pressing force, effectively preventing the pull-key from loosening or falling off during use. At the same time, the rectangular groove shape design makes the positioning of the pull-key more accurate. The overall structure is simple and reliable, and it is easy to achieve quick assembly and firm connection between the pull-key and the tube sheet.

[0007] Based on the above technical solution, the keyed tube sheet assembly of this utility model can be further improved as follows:

[0008] The slot width of the keyway is distributed in a trapezoidal shape, wider at the top and narrower at the bottom, along the thickness direction of the tube sheet body, and the bottom width of the keyway is smaller than the top slot width.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the groove width of the pull key is designed in a trapezoidal shape with a wider top and a narrower bottom along the thickness direction of the tube sheet body. This allows the pull key to be naturally guided along the trapezoidal groove and smoothly enter the bottom of the groove during insertion. This trapezoidal structure can form a better mechanical constraint when the locking wedge applies the wedge force. The narrower bottom width design enhances the contact tightness between the pull key and the bottom of the groove, effectively improving the stability and load-bearing capacity of the connection.

[0010] Furthermore, the angle between the wedge-shaped inclined surface of the locking wedge block and the vertical direction is 15° to 30°, and the wedge-shaped inclined surface has a flat surface structure.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the angle between the wedge-shaped inclined surface of the locking wedge and the vertical direction is set in the range of 15° to 30°. This angle range can ensure that the wedge generates a sufficiently large radial clamping force during movement, and can also avoid the self-locking phenomenon caused by the angle being too small, which will affect the disassembly operation. At the same time, the wedge-shaped inclined surface design with a flat surface structure makes the distribution of clamping force more uniform, avoids the occurrence of stress concentration, extends the service life of the connecting parts, and improves the reliability and maintainability of the connection.

[0012] Furthermore, a longitudinal guide groove is provided on the inner wall of the pull key groove, and a guide protrusion that cooperates with the longitudinal guide groove is provided on the side of the locking wedge, and the guide protrusion extends along the length direction of the locking wedge.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a longitudinal guide groove is opened on the inner wall of the key slot, and a guide protrusion is set on the side of the locking wedge to cooperate with it. This guide cooperation structure can accurately limit the movement trajectory of the locking wedge, ensuring that the wedge always moves in a straight line along the set depth direction, avoiding the wedge from shifting or tilting during the clamping process, making the contact between the wedge-shaped inclined surface and the side of the key more stable and uniform, effectively improving the transmission efficiency of the clamping force and the overall reliability of the connection.

[0014] Furthermore, the locking wedge block has several anti-slip patterns evenly distributed on its wedge-shaped inclined surface, and the anti-slip patterns are distributed in a transverse stripe pattern perpendicular to the inclination direction of the wedge-shaped inclined surface.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: Several anti-slip patterns are evenly distributed on the wedge-shaped inclined surface of the locking wedge block. These anti-slip patterns, which are distributed in a transverse stripe pattern, can significantly increase the friction coefficient between the wedge-shaped inclined surface and the side of the key, effectively preventing relative slippage between the key and the wedge block when subjected to vibration loads or alternating stress. At the same time, the transverse arrangement of the anti-slip patterns is matched with the direction of the wedge tightening force, which can better transmit and disperse the clamping force, further enhancing the connection's resistance to loosening and long-term stability.

[0016] Furthermore, the tube sheet body is provided with reinforcing ribs around the keyway groove. The reinforcing ribs are perpendicular to the main plane of the tube sheet body and extend along the length of the keyway groove. The height of the reinforcing ribs is 2 to 3 times the thickness of the tube sheet body.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a reinforcing rib plate perpendicular to the main plane is set around the key groove of the tube sheet body. The reinforcing rib plate extends along the length of the key groove and its height reaches 2 to 3 times the thickness of the tube sheet body. This reinforcing rib plate structure can significantly improve the stiffness and deformation resistance of the tube sheet body in the area around the key groove, effectively disperse and bear the concentrated load transmitted by the key, prevent the tube sheet body from undergoing local deformation or cracking during long-term load bearing, and greatly improve the load bearing capacity and reliability of the entire joint.

[0018] Furthermore, a buffer groove is provided at the bottom of the key slot, the depth of which is 1 / 4 to 1 / 3 of the total depth of the key slot, and the cross-section of the buffer groove is semi-circular.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: A buffer groove with a depth of 1 / 4 to 1 / 3 of the total groove depth is set at the bottom of the key groove. The groove adopts a semi-circular arc cross-section design, which can provide a certain buffer space when the key is inserted to the bottom, avoiding rigid collision between the bottom of the key and the bottom of the groove and causing damage. At the same time, the semi-circular arc structure can effectively reduce stress concentration, making the stress distribution on the bottom of the key more uniform, extending the service life of the key and the tube sheet body, and improving the overall durability of the joint.

[0020] Furthermore, the locking wedge is made of high-strength alloy steel, and the tube sheet body is made of carbon structural steel.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the locking wedge is made of high-strength alloy steel, and the tube sheet body is made of carbon structural steel. This material combination scheme fully considers the stress characteristics and functional requirements of different components. The locking wedge made of high-strength alloy steel has excellent hardness and wear resistance, and can maintain the geometric accuracy and clamping performance of the wedge-shaped inclined surface under long-term wedge tightness. The tube sheet body made of carbon structural steel has a good balance of strength and toughness, which can withstand large loads and has a certain deformation absorption capacity.

[0022] Furthermore, an operating plane is provided on the non-wedge-shaped inclined side of the locking wedge block, and the operating plane is positioned opposite to the wedge-shaped inclined surface and parallel to the depth direction of the keyway groove.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: An operating plane is set on the non-wedge-shaped inclined side of the locking wedge block, which is opposite to the wedge-shaped inclined surface and parallel to the depth direction of the key groove. This operating plane design provides an ideal working surface for applying driving force during installation and disassembly. By applying a pushing or pulling force along the depth direction to the operating plane, the operator can easily achieve precise movement and position control of the locking wedge block, which greatly simplifies the assembly operation process and improves installation efficiency and disassembly convenience.

[0024] Furthermore, the edge of the keyway groove is provided with a chamfer structure, the chamfer angle of the chamfer structure is 45°, and the chamfer width along the plane of the tube sheet body is 1 / 10 to 1 / 8 of the width of the keyway groove.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: A chamfer structure with a 45° chamfer angle and a chamfer width of 1 / 10 to 1 / 8 of the groove width is set at the edge of the key slot. This moderate chamfer design can effectively guide the key to smoothly enter the slot in the initial stage of insertion, avoiding jamming or damage caused by the key edge colliding with the right angle of the groove. At the same time, the chamfer structure can also eliminate stress concentration at the edge of the groove, improve the fatigue resistance of the tube sheet body at the groove position, facilitate assembly operation and enhance the reliability of the structure.

[0026] Compared with existing technologies, the advantages of the key-tube sheet connector provided by this utility model are as follows: This utility model adopts a wedge-type fixed connection structure, which utilizes the wedge-shaped inclined surface of the locking wedge block to generate a continuous and stable radial clamping force in the key groove, thus achieving reliable fixation between the key and the tube sheet. Compared with traditional welding methods, it avoids the problem of material property degradation in the heat-affected zone. Compared with bolt connection methods, it reduces the destructive processing of the tube sheet body and has better anti-loosening performance. The trapezoidal groove design, combined with the appropriate angle setting of the wedge-shaped inclined surface, enables the connection structure to maintain a stable clamping state when subjected to various complex loads. The cooperation of the longitudinal guide groove and the guide convex strip, as well as the anti-slip texture on the wedge-shaped inclined surface, further enhances the accuracy of the connection and the anti-slip capability. The setting of the reinforcing rib and the buffer groove further improves the load-bearing capacity and durability of the overall structure from the perspective of improving the rigidity of the tube sheet body and stress dispersion. The humanized design of the operating plane and the chamfered structure makes the installation and disassembly operations more convenient and efficient. The overall solution has a simple and reasonable structure, is easy to assemble and maintain, and has high connection reliability, which is significantly better than various connection methods in the existing technology. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a keyed tube sheet assembly;

[0029] Figure 2 This is a cross-sectional view of a keyed tube sheet assembly;

[0030] Figure 3 A schematic diagram of a locking wedge block for a keyed tube sheet assembly;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Tube sheet body; 2. Keyway groove; 3. Locking wedge; 4. Keyway. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The image shows a first embodiment of a key-tube sheet assembly provided by this utility model. In this embodiment, it is used to achieve a fixed connection between the key 4 and the tube sheet. It includes a tube sheet body 1, a key groove 2, and a locking wedge 3. The tube sheet body has a flat plate structure and a through key groove is provided on the tube sheet body. The key groove extends along the thickness direction of the tube sheet body and is rectangular. The locking wedge is disposed inside the key groove and has a wedge-shaped inclined surface. The wedge-shaped inclined surface forms a wedge-tight fit with the inner wall of the key groove. When the key is inserted into the key groove, the locking wedge moves along the depth direction of the key groove and applies a radial clamping force to the side of the key through the wedge-shaped inclined surface, thereby achieving a tight connection between the key and the tube sheet body.

[0035] In the above technical solution, the width of the key slot is distributed in a trapezoidal shape with a wider top and narrower bottom along the thickness direction of the tube sheet body, and the bottom width of the key slot is smaller than the top slot width.

[0036] Furthermore, in the above technical solution, the angle between the wedge-shaped inclined surface of the locking wedge block and the vertical direction is 15° to 30°, and the wedge-shaped inclined surface has a flat surface structure.

[0037] Furthermore, in the above technical solution, a longitudinal guide groove is provided on the inner wall of the key slot, and a guide protrusion that cooperates with the longitudinal guide groove is provided on the side of the locking wedge, and the guide protrusion extends along the length direction of the locking wedge.

[0038] Furthermore, in the above technical solution, the wedge-shaped inclined surface of the locking wedge block is evenly distributed with several anti-slip patterns, which are distributed in a transverse stripe pattern perpendicular to the inclination direction of the wedge-shaped inclined surface.

[0039] Furthermore, in the above technical solution, the tube sheet body is provided with reinforcing ribs around the keyway groove. The reinforcing ribs are perpendicular to the main plane of the tube sheet body and extend along the length direction of the keyway groove. The height of the reinforcing ribs is 2 to 3 times the thickness of the tube sheet body.

[0040] Furthermore, in the above technical solution, a buffer groove is provided at the bottom of the key groove, the depth of the buffer groove is 1 / 4 to 1 / 3 of the total depth of the key groove, and the cross-section of the buffer groove is semi-circular.

[0041] Furthermore, in the above technical solution, the locking wedge is made of high-strength alloy steel, and the tube sheet body is made of carbon structural steel.

[0042] Furthermore, in the above technical solution, an operating plane is provided on the non-wedge-shaped inclined side of the locking wedge block. The operating plane is positioned opposite to the wedge-shaped inclined surface and parallel to the depth direction of the keyway groove.

[0043] Furthermore, in the above technical solution, the edge of the keyway groove is provided with a chamfer structure, the chamfer angle of the chamfer structure is 45°, and the chamfer width along the plane of the tube sheet body is 1 / 10 to 1 / 8 of the width of the keyway groove.

[0044] The following is a specific embodiment 1 of this utility model: The keyed tube sheet assembly in this embodiment is applied to the sliding guide rail system of heavy machinery equipment. The tube sheet body is made of Q345 carbon structural steel, with a thickness of 12mm, a length of 200mm, and a width of 80mm. The surface of the tube sheet body is sandblasted and then coated with anti-rust paint. The keyed groove is located at the geometric center of the tube sheet body, extending through the entire tube sheet along its length. The top opening of the groove is 25mm wide, the bottom opening is 20mm wide, and the groove depth is 15mm. The angle between the inner wall of the groove and the vertical direction is 3°, forming a trapezoidal distribution that is wider at the top and narrower at the bottom. A 3mm deep and 5mm wide groove is opened on each of the inner walls of the groove. The longitudinal guide groove is parallel to the depth direction of the slot and extends through the entire depth of the slot. A 5mm deep buffer groove is provided at the bottom of the slot, with a semi-circular cross-section and a radius of 10mm. The edge of the slot opening has a 45° chamfer with a width of 2mm. Reinforcing ribs, 30mm high and 8mm thick, are provided on both sides of the key slot. These ribs are perpendicular to the main plane of the tube sheet and extend along the entire length of the slot. The locking wedge is made of 40Cr high-strength alloy steel, and after tempering heat treatment, its hardness reaches HRC42~HRC48. The wedge length is 180mm, matching the length of the key slot. The wedge-shaped inclined surface of the wedge makes an angle of 22° with the vertical direction, and the inclined surface length is 60mm. Eight anti-slip grooves, 7mm apart, 0.8mm deep, and 1.5mm wide, are evenly distributed on the wedge-shaped inclined surface. These grooves are horizontal stripes perpendicular to the inclined direction of the surface. Each side of the wedge has a guide ridge that mates with a longitudinal guide groove. The ridge is 2.8mm high and 4.8mm wide, maintaining a 0.1mm–0.2mm clearance with the guide groove. A flat operating surface, parallel to the groove depth and 30mm x 180mm in area, is provided on the non-wedge-shaped inclined side of the wedge to facilitate the application of driving force. During use, the precision-machined pull key is first inserted into the pull key groove. The pull key's width is 19.5mm, forming a 0.5mm clearance with the bottom width of the groove. Then, align the guide convex strip of the locking wedge with the longitudinal guide groove and push it downward. When the wedge moves down 8mm to 10mm, the wedge-shaped inclined surface begins to contact the side of the key and generate radial clamping force. Continue to push the wedge to the predetermined position of moving down 12mm. At this time, the radial clamping force generated by the wedge-shaped inclined surface on the key meets the usage requirements. The anti-slip texture fully engages with the surface of the key to form a stable and reliable wedge-tight connection. In actual use, this connector can withstand alternating loads and vibration impacts from the guide rail system. The key and the tube sheet always maintain a stable connection. The reinforcing ribs effectively improve the local stiffness of the tube sheet and prevent deformation under long-term load. The entire connector has a compact structure and high reliability, meeting the usage requirements of heavy machinery equipment.

[0045] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, and improves the wedge-shaped inclined surface structure of the locking wedge block. A longitudinal groove with a depth of 1.5mm and a width of 4mm is opened in the middle of the wedge-shaped inclined surface along the length direction. This longitudinal groove divides the originally straight wedge-shaped inclined surface into two symmetrical inclined surface areas. This improved design allows the two symmetrical inclined surface areas to apply clamping force to both sides of the pull key when the wedge block moves downward to clamp the pull key, forming a more balanced double-sided clamping effect. At the same time, the presence of the longitudinal groove can also accommodate any small protrusions or foreign objects that may exist on the surface of the pull key, avoiding the impact of local interference on the overall clamping effect. In addition, the number of anti-slip textures is increased to 12, the spacing is reduced to 5mm, and the depth is increased to 1.2mm, further improving the anti-slip performance. This improved structure is particularly suitable for applications that need to withstand greater vibration loads or have higher requirements for connection stability. Through balanced double-sided clamping and enhanced anti-slip design, the reliability of the connection is further improved.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 is based on Embodiment 1, with optimizations and improvements to the structure of the tube sheet body and the keyway groove. On the back of the tube sheet body, i.e., the side opposite to the keyway groove, a backing reinforcement plate with a thickness of 10mm, a length of 220mm, and a width of 100mm is added along the projection position of the groove. This backing reinforcement plate is fixedly connected to the tube sheet body by eight 6mm diameter bolts, which are evenly distributed along the length of the groove on both sides. This backing reinforcement plate further improves the overall rigidity and bending resistance of the tube sheet in the keyway groove area, making it particularly suitable for bearing large concentrated loads. Under load conditions, the trapezoidal angle of the key slot was adjusted from 3° to 4°, increasing the width difference between the top and bottom to 6mm. This adjustment provides better guidance during key insertion and creates stronger lateral constraint in the wedge-tight state. In addition, three pressure relief holes with a diameter of 3mm and a depth of 5mm were added to the bottom of the buffer groove. These pressure relief holes can discharge air and any coolant or lubricating oil that may be present in the slot when the key is inserted, avoiding the hydraulic effect from affecting the key insertion depth and the final wedge-tightening effect. This improved solution, through multi-faceted structural optimization, comprehensively enhances the overall performance of the connector and is suitable for more demanding working environments.

[0047] Specifically, the principle of this utility model is as follows: The core technical principle of this utility model lies in utilizing the mechanical amplification effect and self-locking characteristics of the wedge mechanism to achieve reliable fixation between the key and the tube sheet. When the locking wedge moves downward along the depth direction of the key groove, the wedge-shaped inclined surface contacts the side of the key and generates a force along the normal direction of the inclined surface. According to the principle of force decomposition, this normal force can be decomposed into a component force along the vertical direction and a component force along the horizontal direction. The horizontal component force is the radial clamping force applied to the side of the key. Since there is an angle of 15° to 30° between the wedge-shaped inclined surface and the vertical direction, a relatively small vertical driving force can generate a large radial clamping force, achieving effective force amplification. This radial clamping force is firmly pressed onto the inner wall of the key groove by the key, forming stable friction. The trapezoidal distribution design of the key slots allows the key to contact multiple surfaces of the slots simultaneously when subjected to radial clamping force, forming a multi-point constraint state and further enhancing the stability of the connection. The cooperation between the longitudinal guide groove and the guide convex strip ensures the accuracy of the wedge movement trajectory and avoids uneven distribution of clamping force caused by wedge offset. The anti-slip texture increases the friction coefficient of the contact surface, improving the anti-slip capability. The reinforcing rib reduces deformation by increasing the local stiffness of the tube sheet. The buffer groove avoids stress concentration by providing buffer space and improving stress distribution. All these technical features work together to ensure the reliability and stability of the connection from a mechanical perspective. At the same time, the reversibility of the wedge mechanism allows for easy disassembly by applying reverse force, solving the contradiction between reliability and disassembly in traditional connection methods.

[0048] The specific operation or use method of this utility model is as follows: First, align the pull key with the pull key groove on the tube sheet body. Utilize the chamfered structure of the groove opening to guide the pull key smoothly into the groove. Since the pull key groove is trapezoidal in shape, wider at the top and narrower at the bottom, the pull key will naturally guide along the trapezoidal groove wall and gradually penetrate to the bottom of the groove during insertion. At this point, the bottom end of the pull key enters the buffer groove range. Then, place the locking wedge at the opening of the pull key groove, aligning the guide protrusion on the side of the wedge with the longitudinal guide groove on the inner wall of the groove. By applying a downward thrust along the groove depth direction to the operating plane of the locking wedge, the wedge is driven to move downward along the guide groove. During the movement, the wedge... The inclined surface gradually contacts the side of the key and generates radial clamping force. The thrust is continuously applied until the wedge reaches the predetermined position. At this time, the anti-slip texture on the wedge-shaped inclined surface fully contacts the side of the key, forming a stable wedge-tight state. The key is firmly pressed into the key groove, completing the reliable connection between the key and the tube sheet. During use, the reinforcing ribs around the tube sheet body can effectively bear and distribute various loads transmitted through the key. When disassembly is required, simply apply an upward pulling force to the operating plane of the locking wedge. Utilizing the reversibility of the wedge mechanism, the wedge is pushed out upward along the guide groove, releasing the clamping force on the key. Then, the key can be easily removed. The entire operation is simple and convenient, requiring no special tools.

Claims

1. A keyed tube sheet connector, characterized in that, This device is used to achieve a fixed connection between a key and a tube sheet. It includes a tube sheet body, a key slot, and a locking wedge. The tube sheet body is a flat plate structure with a through key slot. The key slot extends along the thickness direction of the tube sheet body and is rectangular. The locking wedge is disposed inside the key slot and has a wedge-shaped inclined surface. The wedge-shaped inclined surface forms a wedge-tight fit with the inner wall of the key slot. When the key is inserted into the key slot, the locking wedge moves along the depth direction of the key slot and applies a radial clamping force to the side of the key through the wedge-shaped inclined surface, thereby achieving a tight connection between the key and the tube sheet body.

2. The keyed tube sheet connector according to claim 1, characterized in that, The slot width of the keyway is distributed in a trapezoidal shape along the thickness direction of the tube sheet body, with the bottom width of the keyway being smaller than the top slot width.

3. A keyed tube sheet connector according to claim 2, characterized in that, The angle between the wedge-shaped inclined surface of the locking wedge and the vertical direction is 15° to 30°, and the wedge-shaped inclined surface has a flat surface structure.

4. A keyed tube sheet assembly according to claim 3, characterized in that, The inner wall of the pull key groove is provided with a longitudinal guide groove, and the side of the locking wedge is provided with a guide protrusion that cooperates with the longitudinal guide groove. The guide protrusion extends along the length direction of the locking wedge.

5. A keyed tube sheet connector according to claim 4, characterized in that, The locking wedge block has several anti-slip patterns evenly distributed on its wedge-shaped inclined surface. The anti-slip patterns are distributed in a horizontal stripe pattern that is perpendicular to the inclination direction of the wedge-shaped inclined surface.

6. A keyed tube sheet assembly according to claim 5, characterized in that, The tube sheet body is provided with reinforcing ribs around the keyway groove. The reinforcing ribs are perpendicular to the main plane of the tube sheet body and extend along the length of the keyway groove. The height of the reinforcing ribs is 2 to 3 times the thickness of the tube sheet body.

7. A keyed tube sheet assembly according to claim 6, characterized in that, The bottom of the keyway is provided with a buffer groove, the depth of which is 1 / 4 to 1 / 3 of the total depth of the keyway, and the cross-section of the buffer groove is semi-circular.

8. A keyed tube sheet assembly according to claim 7, characterized in that, The locking wedge is made of high-strength alloy steel, and the tube sheet body is made of carbon structural steel.

9. A keyed tube sheet assembly according to claim 8, characterized in that, An operating plane is provided on one side of the non-wedge-shaped inclined surface of the locking wedge block. The operating plane is positioned opposite to the wedge-shaped inclined surface and parallel to the depth direction of the keyway groove.

10. A keyed tube sheet assembly according to claim 9, characterized in that, The edge of the keyway groove is provided with a chamfer structure, the chamfer angle of the chamfer structure is 45°, and the chamfer width along the plane of the tube sheet body is 1 / 10 to 1 / 8 of the width of the keyway groove.

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